Typical Weather in Helena, MT in May

66° F Avg High

41° F Avg Low

5 Rainy Days

☀️ Temperature Summary

Highs in May are typically around 66°F, which is warmer than usual in Helena. Lows overnight are typically around 41°F. Daily high temperatures can range between 63°F and 72°F, and will often rise as the month goes on.

May is a great time to visit Helena, with mild temperatures and sunny days being very common.

High Temps Throughout the Year

☔ Rain Summary

You can expect about a 17% chance of rain for any given day in May. It's one of the rainier months of the year for Helena, with total rainfall for the month around 2 inches.